Stay calm and don't let your imagination drive you crazy; it's tough, but not the end of the world.
Try to prepare yourself mentally for this discussion and what you want vs. what is best.
If he is using them, that's better than not using them. I would also want to ensure his partner was using another form of bc, because we all know these are not fail proof.
On the other other hand, they could be a camp-prank or as another poster suggested a test run for future use.
:grouphug: Big hug, I hope the conversation go well. Dad might be a better conversation facilitator than mom.